CAJ | 학술논문

采用干凝胶法，以聚碳硅烷（PCS ）为原料，通过炉内成球技术制备了SiC空心陶瓷微球。并利用TG、IR、SEM、XRD等方法对陶瓷微球进行了成键结构、表面形貌等分析，讨论了有机聚合物的陶瓷化过程机理。结果表明，干凝胶成球技术能利用经纯化处理的聚碳硅烷在500～600℃下得到SiC空心陶瓷微球，采用乙醇作为发泡剂可使 PCS凝胶粒子得到良好发泡效果，提高载气中氦气含量至50％～80％可提高干凝胶粒子在吸热阶段的升温速率，微球经辐照后在850℃下碳化生成以β-SiC为主要相结构的球壳，球壳具有较好的表面平整度。
채용간응효법，이취탄규완（PCS ）위원료，통과로내성구기술제비료SiC공심도자미구。병이용TG、IR、SEM、XRD등방법대도자미구진행료성건결구、표면형모등분석，토론료유궤취합물적도자화과정궤리。결과표명，간응효성구기술능이용경순화처리적취탄규완재500～600℃하득도SiC공심도자미구，채용을순작위발포제가사 PCS응효입자득도량호발포효과，제고재기중양기함량지50％～80％가제고간응효입자재흡열계단적승온속솔，미구경복조후재850℃하탄화생성이β-SiC위주요상결구적구각，구각구유교호적표면평정도。
SiC ceramic microspheres were fabricated by drop-tower technique at low tem-perature using polycarbosilane (PCS ) as raw material . T he as-prepared microspheres were characterized by TG ,IR ,SEM and XRD .The reaction mechanism of organic poly-mer and the effects of process parameters (composition of furnace atmosphere and tem-perature) were investigated .The results show that ethanol as a blowing agent has a high blowing efficiency ,and the content of helium gas in the furnace atmosphere ranging rising to 50%-80% can increase the heating-up rate of gel particles in heat-absorbing stage .The high sphericity morphology is obtained at 500-600 ℃ .Moreover ,the SEM spectra indicate that irradiation can increase the surface finish quality and evenness of hollow SiC ceramic microspheres .